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Why is commissioning always compressed and late?June 2011


So what's gone wrong with comissioning and how can we stop it being squeezed?
Commissioning a building is often treated by construction teams as a chore - the thing that stands between them and achievement of practical completion. By definition it is one of the final acts prior to finishing a job and leaving site.

Even the best laid construction plans can be compromised by events - client, variations, contractor insolvency, severe weather - the result of which is usually compressed commissioning. While construction is often a fluid process, completion dates are always fixed. Therein lies the problem: expediance rules when the client has to move in.

The nature of the problem

The consequence of squeezing commissioning into shorter timescales will almost certainly backfire both on the client and the project team. Poorly commissioned systems will not self-correct afterwards. The truth will out, and clients will demand action.


Figure 1: How commissioning is often carried out (click image to zoom)
Faced with unexpected challenges and remedial work, some contractors simply disappear. Contractors will walk away from a £25 000 retention if doing so allows them to resource a £25 million project elsewhere.

BSRIA has reviewed evidence of commissioning practice gathered by the Carbon Trust under its Low Carbon Buildings Programme LCBP). Evidence of both successful and less successful commissioning has lifted the lid on the causes and effects.

Figure 1 shows how commissioning was conducted on those projects that suffered shortcomings in commissioning management. In some cases the commissioning plan was rudimentary and threadbare, and little thought was given to the activity until systems were installed and needed verifying against the specification.

The problems were most acute with innovative low and zero carbon technologies that proved relatively more fragile than conventional systems, and needed far more attention than they got. The Carbon Trust found that the operational savings in energy and carbon dioxide were nowhere near the design estimates. It wasn't the technology itself - it was the way it was commissioned.

A possible solution


Table 1: A model approach to commissioning derived from commissioning experiences on the Carbon Trust's Low Carbon Building Performance and Low Carbon Accelerator research programmes (click image to zoom)
The Carbon Trust's LCBP?research has led to a rethink of the commissioning process. The LCBP?studies showed that commissioning should not be a single operation carried out prior to building completion, but should routinely be far more of a continuous process that extends through and beyond the contracted completion date. Table 1 illustrates the component parts of a commissioning management plan that takes into account fine tuning and professional aftercare in the weeks and months following completion.

Essentially, the plan breaks down into three distinct phases: Planning, initial (static) commissioning, and continuous commissioning and fine-tuning. This is the Soft Landings view of the world: that commissioning activities should be extended across the design, construction and occupation phases of the building, rather than considered a single activity.

Features over the following months will explain this process in more detail.

BSRIA runs a series of commissioning training courses, including Management of the commissioning process and also publishes a range of commissioning guides.

 

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